LTC3859ALEFE#PBF External Power Switch Boost Controllers by Analog Devices

Status: Production
Series: LTC3859AL
RoHS: Compliant
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The LTC3859AL is a high performance triple output (buck/buck/boost) synchronous DC/DC switching regulator controller that drives all N-channel power MOSFET stages. Constant frequency current mode architecture allows a phase-lockable switching frequency of up to 850kHz. The LTC3859AL operates from a wide 4.5V to 38V input supply range. When biased from the output of the boost converter or another auxiliary supply, the LTC3859AL can operate from an input supply as low as 2.5V after start-up.The 28μA no-load quiescent current extends operating runtime in battery powered systems. OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3859AL features a precision 0.8V reference for the bucks, 1.2V reference for the boost and a power good output indicator. The PLLIN/MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous inductor current mode at light loads.Compared to the LTC3859 and the LTC3859A, the LTC3859AL is fully pin-compatible, but with lower Burst Mode operation IQ (28µA with one channel on). Quiescent Current (Burst Mode) Notes LTC3859AL 28μA-One channel on, Buck 38μA-All three channels on Internal clamp on the INTVCC pin LTC3859A 55μA-One channel on, Buck 80μA-All three channels on Internal clamp on the INTVCC pin. For new designs, we recommend LTC3859AL LTC3859 55μA-One channel on, Buck 80μA-All three channels on For new designs, we recommend LTC3859AL

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Features

Low Operating IQ: 28μA (One Channel On)
Dual Buck Plus Single Boost Synchronous Controllers
Outputs Remain in Regulation Through Cold Crank Down to 2.5V
Wide Bias Input Voltage Range: 4.5V to 38V
Buck Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
Boost Output Voltage Up to 60V
RSENSE or DCR Current Sensing
100% Duty Cycle for Boost Synchronous MOSFET Even in Burst Mode® Operation
Phase-Lockable Frequency (75kHz to 850kHz)
Programmable Fixed Frequency (50kHz to 900kHz)
Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode Operation at Light Loads
Very Low Buck Dropout Operation: 99% Duty Cycle
Adjustable Output Voltage Soft-Start or Tracking
Low Shutdown IQ: 10μA
Small 38-Lead 5mm × 7mm QFN and TSSOP Packages

Last 6 months Inventory & Pricing History


Alternative Descriptions

DC/DC Cntrlr Triple-OUT Step Down/Step Up 900kHz Automotive 38-Pin TSSOP EP Tube | Richardson RFPD


LTC3859ALEFE#PBF Semiconductors - ICs by Linear Technology

DC-DC CNTRL BUCK-BOOST 900KHZ TSSOP38

Status: Unknown
Series: -
RoHS: Unknown
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Specifications

Supply Voltage Min 4.5V
Supply Voltage Max 38V
No. of Outputs 3 Output, 3Outputs
Duty Cycle (%) 100%
Controller IC Case Style TSSOP
No. of Pins 38Pins
Switching Frequency 585kHz
Topology Synchronous Boost Synchronous Buck Synchronous Buck
Operating Temperature Min -40°C
Operating Temperature Max 125°C
Product Range -
Automotive Qualification Standard -
RoHS Phthalates Compliant Yes
MSL MSL 1 - Unlimited
SVHC No SVHC (15-Jan-2018)
Device Type MOSFET
Driver Case Style TSSOP
Input Delay 95ns
Module Configuration N Channel

Last 6 months Inventory & Pricing History


Frequently Asked Questions

Where can I find additional details, specifications and documents for a LTC3859ALEFE#PBF?

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What category does LTC3859ALEFE#PBF fall under?

The LTC3859ALEFE#PBF is listed under External Power Switch Boost Controllers.

Can I view similar or alternative parts?

You can view similar parts to LTC3859ALEFE#PBF when available in the External Power Switch Boost Controllers range under the specifications section at the bottom of the details page.

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Is the LTC3859ALEFE#PBF RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by Analog Devices.

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